The nice thing about the sticks is that the wrappers are marked in 1-TBSP increments, so if you need 4-TBSP for a recipe, you just slice that much off. Many recipes here list butter quantities in Tablespoons. I'm not sure what measurements are commonly used around the world.
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CD
Usually butter would be measured in grams in the UK and sometimes you find the packets are marked similarly with increments. With hard cooking fat this is more usual.